SUMMARY - A Brazilian study has concluded that there is no benefit to pregnant women taking the anti-viral oseltamivir (known also as "Tamiflu") in order to prevent severe disease or death from Covid-19. Oseltamivir was a desirable option in the country of Brazil due to its low-cost and accessibility, as opposed to other anti-virals at the time.
NOTE - There is another study conducted earlier with a general population that cites a reduction of 2.5%. Given the two studies (no statistical difference & 2.5%), perhaps relying on oseltamivir shouldn't be anyone's "Plan A" for avoiding adverse Covid-19 outcomes, especially given that there are far better options (Moderna & Pfizer) available.
LINK - https://link.springer.com/article/10.1186/s12879-025-12327-xLINK (to the "other study") - https://www.sciencedirect.com/science/article/pii/S0924857924000293
